Car roof



May 22, 1923.

c. D. BcNsALL.

GAR ROOF Filed March 5l. 1922 Patented May E2,

CHARLES DAVID BONSALL, kOF PTTSBURGH, PENNSYLVANA, ASSGNOR TOP. Ii.MURPHY COMPANY, OF l'l'llllf KENSNGTON? FENNSYLVANIA, A. CORPORATION 0FPENNSYLVANIA.

CAR ROOF.

Application led March 31, 1922. Serial No. 543,289.

To all w from t may concern Be it known that I, CHARLES Divin) Bon sALL,a citizen of the United States, and a resident of the city .ofPittsburgh, county of Allegheny, and State of Pennsylvania,

have invented a new and useful lmprovement in Car Roofs,.of which .thefollowing is a specification. *i

' 'lhisinvention -relates principally to allsteel riveted-up car roofsof the hind shown in my pending application Ser. BT04516560@ tiledNovember 21 1921l wherein'the'roolino sheets extend from side plate toside plate and are formed along their side margins with channeledportions .that are lapped portions and riveted together to formweather-proofing hollow boiegirder `jointsor seams that function ascarlines. A

The principal object ofthe present invenf tion isto reduce 'the' numberof channeled sheets required for roofs of the above type and'therebysave the' cost off'pressing such sheets. Other objects are to reduce theweight of the roof to increase the strength thereof and to facilitateassembly. The invention consists principally `in forming a 'roof' of'the above type by means of alternat-ely arranged sheets of two types;and it also consists iin the parts and arrangements and combinations ofparts hereinafter described and claimed.

In the accompanying difa\ving,wvlierein like symbols refer to like partswhereif'erv they occur7 p Fig. 1 is a plan view of an end portion of acarroof embodying' my invention;

Fig. 2 is an enlarged,transverse section through one half of the roof onthe line 2 2 in 1; c Fig. 3 is a longitudinal cross-section through theridge portion of the roof on the line 3)3 in Fig. 1; p

Fig. 4 is a longitudinal cross-section through a portion of the roofbetween the ridge andl the yeaves on the line 1 -Ll in Fig.v 1

Fig. y5 isv a similar section through the eaves portion ofthe car on theline 5 5 in Fig.l;and

Figs. 6 and 7 are longitudinal ridge sections embodying modiied forms ofroof constructions.

f' The roof shown in Figs. 1 to 5, inclusive. of the accompanying`drawing comprises heavy gage roof sheets which extend from eaves toeaves of the car. The roof sheets are supported 'at vtheir eaves ends onthe outwardly extending` flanges of angle har sideplates 9 and arerigidly secured thereto by rivets 10. LThe roof sheets are preferablyprovided with depending crip flanges 11 that overhangthe outer edges osaid side plates 9. VThe roof sheets are or two types,r the sheets ofone type alternating with those oi the other type. The roof sheets ofthe type A. are in the form of flat rectangular sheets; and the roofsheets of the type B have strengthening ribs' or channels 12 and 13pressed therein adjacent to their respective side margins, the channels12 at one side margin of a sheet openingupwardly and the channels 13 atthe opposite'side margingot said sheet opening downwardly. The ribs 12and 13 have al minimum width at the ridge and widen gradually to theeaves and are of lgradual decreasingy depth from-ridge to the eaves. l

rllhe sheets of the two types are arranged alternately and are assembledby lapping their side marginal portions; that is, the downwardly openingrib 13 in one side margin of a type B sheet overlap one side marginalportion of a dat type A sheet, whose opposite side marginal portionoverlaps the upwardly opening rib in one side margin of another' type Esheet. rl`he overlapped portions ot said `sheets are rigidlyfsecuredtogetheron opposite sides the ribs by rows of rivets Thus. theoverlapping ,downwardly opening ribs 1.3 the vtype B sheets cooperatewith the u'nderlapping marginal portions of the type A. sheets to forniexterior hollow box-glider seams or joints. and the rinde-flappingnpwardlyopening ribs 12 of said type E vsheets cooperate with theoverlappingmarginal portionsof said type A sheets to form 'exteriorhollow boX-girder or joints which alternate Ywith said reX-terior'boX-girder seams or joints.

The ribs 12 and 13 of the type E sheets are preferably'ofchannel sectionand gradually decrease in depth and height7 respectively.l from theridge towards the eaves where they merge into the rplane of the body ofthe sheets. rlhe upwardly opening` ribs 12 merge into the body of thesheets at the inner faces of the side plates; whereas the downwardlyopening ribs merge abruptly into the body Y of the sheet atthe pointwhere the eaves v the reversely opening channels 12 and 13v ends of thesheets are turned down to torni depending drip flanges 11.

The sheets of the type B are pressed from sheet blanks having parallelsides, with the result that the gradual decreased depths ot creates asurplus of metal that is utilized in securing a uniform widening ofsheets, to-

gether with the channels 12 and 13 therein,

' fromridgetowards the eaves. This arrange- 'ment produces a box-girderseam construction or' deep and narrow section at the ridge,

that is well adapted to withstand the vertical root load', and a broadflat section at the eaves that functions as a gusset to withstandhorizontal stresses.

Running boards 15 are arranged lengthwise'of thecar at the ridge and aresecurely` boltedvto the uppermost lateral flanges of 'Z-shaped runningboard saddles 16, whose lowermostlateral flanges rest on the roof sheetsand are secured thereto by rivets that f vrigidly connect theoverlapping side margif in all of the box-girder. joints are locatedcnal portions of adjacent sheets.

fFlat -end'sheets of the type A.' are provided or each end of the car. IThe ,outerside marginal portions of the end sheets are roofs ot thebox-girder seam type, whichv sheetsareexpensive to manufacture by reasonof. the pressing operation required to form the channels therein. It isalso noted alternating arrangement of the interior and `exteriorbox-girder j oints places the neutral y axis of the' roof in the planeof the body of the sheets, whereby the maximum strength of vthe metalis. obtained for carrying the roof load.

In the modiiication shown in Fig. 6, roof sheets 20, similar to those ofthe type'B, are provided adjacent to their side marginal portions, withdownwardly .opening cha`nnels 21 that overlap the adjacent side marginalportions 'of flat sheets of the type A, thereby forming a roofconstruction where outside of the roof. A f

In the modification shown in Fig.v 7, the root sheets 20 are arrangedwith their ribs opening upwardly, andthe marginal portions of'the flattype A sheets overlap said ribs and are rigidly secured thereto to forminterior 'carlines v Obviously, my invention admits of considerablemodiiication in the designs' of the; i

seams or ribs and I do not wish to be limited `to the specific designsillustrated.

What I claim is:

.1. A car roof comprising a series of roof i sheets connected by raisedseams with depressed seams.

alternating 2. A car roof comprising a series of rootl n `'sheetsconnected by box-girder seams, some of said seams being located abovet-he plane of the root and other of said seams being located belowtheplane of the roof.v

' 3. A car roof comprising a series of roof sheets connected along theirside margins by exterior box-girder seams alternating with interiorbox-girder seams. j 4. A car roof comprising a series of roof sheetsconnected along their'side margins by exterior' hox-girder seams ofvaryingl width from ridgeto leaves alternating with interior box-girder'seams of varying width'v YJfrom ridge to eaves.

' 5. Acar roof comprising a series of root` sheets connected along theirside margins by exterior box-girdermseamsl of' ,varying depth-from ridgeto eaves alternating with interior box-girder 'seamsof ,varying` depthfrom ridgeto eaves. l Y y 6. A car roof comprising a pliiralityofmetal'roof sheets connected alongtheirside 'margins by yexteriorbox-girder ,seams of varying width and depthkfrom ridgel toeaves'alternating with interior box-girder seams of varying width anddepth :trom ridge to eaves. c

7. A car root` comprisingflat roosheets alternating with roof sheetshaving hollow y ribs formed in their sidel marginal portions,

said sheets being arranged with their side marginal portions lappingeach other and rigidly secured togethery to formA hollowbox-girdersea-ins.

8. A car roof comprising fla-t root-sheets i alternating with rootvsheets having hollow' ribs formed in their side marginal portions,

said sheets being arranged with their side l marginal portions lapping`each other and l rigidly secured together to formhollowe-boxgirderseams, the lapped portions of said sheets' being rigidly securedtogether on opposite sides of said hollow rib-s tol form hollowbox-girder seams. g f

9. A car roof comprisingflat roof sheets alternating with roof sheetshaving reverse hollow ribs formed in theirside mar `ns,

said roof sheets being `arranged with't v,eir

side marginal portions lapping eachother and rigidly secured together toform alternating exterior and interior 'box-girder seams.

10. Al car-root` comprising flat roof sheets alternating with roofsheets having reverse hollow ribs formed" lin their sidemargins,said-ribs varying in depth from: ridge to eaves, said roof sheets beingarranged with their side marginal portions lapping each other to formalternating exterior' and interior hollow boX-girder seams of varyingdepth from ridge to eaves.

l1. A car roof comprising flat roof sheets alternating ywith roof sheetshaving reverse hollow ribs formed in their side margins, said ribsvarying in width from ridge to eaves, said roof sheets being arrangedwith their side margins lapping and rigidly secured together on eachside of a rib to form alternating interior and exterior boX- girderseams of varying Width from ridge to eaves.

l2. A car roof comprising fiat roof sheets alternating with roof sheetshaving reverse hollow ribs formed in their side marginal portions, saidribs varying in width and depth from the ridge to eaves, said roofsheets being arranged with their side marginal portions lapping eachother toy form alternating exterior and interior hollow boxgirder seamsthat vary in width and depth from ridge to eaves.

13. A car roof comprising a plurality of metal roof sheets extendingfrom eaves to eaves with their side margins lapping each other andrigidly lsecured together along two lines, the portion of the lowersheets between some lines being formed into channels and the portions ofthe upper sheets between other lines being formed into an invertedchannel, said channels being arranged alternatively.

Signed at New Kensington, Pa., this 27th day of March, 1922.

CHARLES DAVID BoNsALL.

